Method and device for managing allocation of data transmission paths in a meshed communications network, corresponding computer program product and storage means

Abstract

A method for managing allocation of paths for transmission, in packets of symbols, of at least a first data content, each content being transmitted from a source node up to a destination node in a meshed communications network comprising a plurality of nodes, each destination node receiving a plurality of copies of a same packet of symbols of the content transmitted to said destination node by a source node, each copy being received by the destination node via a distinct transmission path directly from the source node or via at least one relay node of the meshed communications network, the packets being encoded with an error correction code enabling decoding by erasure of packets symbols. Such a method comprises the following steps: selecting a set of transmission paths from the source node up to the destination node for the transmission of copies of at least one packet of the first content, for which an estimated first number of erasures of symbols of the at least one packet is smaller than a determined threshold, the first number of erasures being estimated from a piece of information on quality of transmission that is determined and associated with each of the selected transmission paths, the threshold being determined as a function of an erasure correction capability of the error correction code; allocating the selected transmission paths to the transmission of the first content from said source node up to said destination node.

Description

1. FIELD OF THE INVENTION[0001]The field of the invention is that of systems of data transmission in wireless meshed synchronous communications networks.[0002]More specifically, the invention relates to a technique of bandwidth allocation based on error correction in synchronous communications networks that may be subjected to fading and masking caused by fixed or moving obstacles.[0003]The invention can be applied more particularly in the context of the broadcasting of data packets, i.e. cases where a node of the network, called a source node or sender node, broadcasts data packets intended for another node, called a destination node or final receiver node, through the communications network.[0004]The invention can be applied especially to networks where the data packets are relayed by a set of nodes of the network to the destination node. This mode of transmission enables the reception, by the destination node, of a set of copies of the same data packet that will be exploited in o...

AI Technical Summary

Benefits of technology

[0022]Thus, the invention limits the bandwidth consumption needed for each node of the destination node of a data content so that the destination node can perform a successful decoding of the data addressed to it.

[0028]Thus, it is possible to define a sequence of access to the medium of the transmission network by the different nodes of the communications network that enables access to the medium by each of the nodes only once per transmission cycle and thus increases the useful bandwidth of the communications network (through the reduction of overhead).

[0038]Thus, the destination node can carry out a more efficient error correction since this node will receive more copies, even in the event of a change in conditions of transmission.

[0041]The invention therefore makes it possible to achieve adaptive redundancy for all nodes of the communications network.

[0048]This approach prevents the activation of the new retransmission matrix if this matrix gives mediocre performance as compared with the reference retransmission matrix.

Problems solved by technology

Communications in a wireless communications network very frequently undergo interfering and masking which may appreciably lower the quality of the data received.

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